Addition of tool to list hosts in a year

hosts_in_year.sqlite.sql: query to return all hosts contributing shows
    in a period (usually a year)

hosts_list.tpl: `TT²` template to generate an HTML list from the output
    of hosts_in_year.sqlite.sql

make_shownotes: trivial tidying

thanks_to_hosts: Bash script to simplify the generation of the HTML
    which thanks a year's hosts for their contributions

Community_News/hosts_in_year.sqlite.sql

@@ -0,0 +1,17 @@
+--
+-- hosts_in_year.sqlite.sql 2025-10-06
+--
+-- Query for use with 'query2tt2' to generate a list of hosts who contributed
+-- shows in a particular year. Designed to be used with the 'hosts_list.tpl'
+-- template.
+-- The two '?' placeholders in the query are to be filled with 'YYYY-01-01'
+-- for the start of the year and 'YYYY-12-31'. The values can be passed using
+-- the '-dbargs' option to 'query2tt2'.
+--
+SELECT DISTINCT
+    printf('%04d',h.hostid) AS hostid, h.host AS hostname
+FROM eps e
+JOIN hosts h ON e.hostid = h.hostid
+WHERE e.date BETWEEN ? AND ?
+AND title != 'Reserved'
+ORDER BY lower(h.host)